FAN5611S7X Fairchild Semiconductor, FAN5611S7X Datasheet - Page 9

• Manufacturer Part Number: FAN5611S7X
• Description: IC LED DRIVER LINEAR SC-70-6
• Manufacturer: Fairchild Semiconductor
• Type: Linear (Non-Switching)r

Specifications of FAN5611S7X

• Topology: Linear (LDO), PWM
• Number Of Outputs: 4
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: Color, White LED
• Voltage - Supply: 3.3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: SC-70-6, SC-88, SOT-363
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 40mA
• Efficiency: 90%
• Number Of Segments: 4
• Operating Supply Voltage: 0.3 V to 1 V
• Maximum Supply Current: 20 mA
• Maximum Power Dissipation: 700 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Frequency: -
• Internal Switch(s): -
• Lead Free Status / Rohs Status: Details
• Other names: FAN5611S7XTR; FAN5611S7X_NL; FAN5611S7X_NLTR; FAN5611S7X_NLTR

FAN5611/FAN5612/FAN5613/FAN5614 Rev. 1.0.9
© 2003 Fairchild Semiconductor Corporation
Example 3: Drive white, blue, red, amber LEDs string
Assuming a boost circuit or existing voltage bus, the
FAN561X series of LED drivers can be used to drive a
whole string of LEDs with flexible brightness control via
analog and/or PWM. .
LED Brightness Control
All of the FAN561X LED drivers feature analog and
PWM controls to give designers flexible brightness con-
trol. These control methods can be applied to the circuit
in two different ways to provide more flexibility than other
solutions. To determine the value of R
vs. V
1. FAN5611
- Analog
Set V
- PWM
V
V
V
I
CONTROL
LED
CONTROL
CONTROL
– Amplitude sets maximum LED current.
– Pulse width controls between 0 and maximum.
ENABLE
CTRL
CONTROL
=
V
IN
R
200
-------------------------------------------------------------------------
(3V
I
SET
SET
graph in Figure 4.
= PWM
V
)
IN
R
×
I
SET
SET
and R
(
CTRL
ON/OFF
V
I4
CONTROL
R
SET
CTRL
I4
SET
FAN5613
I3
GND
for LED current using:
–
I3
V
I2
FAN5611
CTRL
GND
)
I1
I2
SET
, use the I
'N' number of
LEDs Per Branch
I1
SET
9
where V
Key advantage:
• No need for current matching resistors and discrete
2. FAN5612
- Analog
Set V
- PWM - 1
V
- PWM - 2
Set V
ON/OFF = PWM
I
I
CONTROL
LED
LED
transistor for brightness control.
– V
– V
– V
– Amplitude sets maximum LED current.
– Pulse width controls between 0 and maximum.
– Amplitude has no effect on current.
– Pulse width controls between 0 and maximum.
V
CONTROL
CONTROL
CONTROL
∼
=
DROP
IN_MIN
IN _MAX
200 I
IN
200
-------------------------------------------------------------------------
= existing bus, boost voltage.
= PWM
ENABLE
×
< 0.3V
×
= N ¥ V
V
= N ¥ V
and R
SET
IN
and R
R
(
I
SET
V
SET
CONTROL
R
SET
SET
F
SET
F
CTRL
ON/OFF
+ V
+ 5.5V
for maximum LED current using:
I3
for LED current using:
DROP
–
V
CTRL
FAN5612
GND
I2
)
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I1